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#super-resolution

2 public questions tagged with this topic.

Microscopy

Which microscopy gives the highest resolution among light-based techniques?

Among light-based modalities, single-molecule localization techniques achieve finest resolution, surpassing confocal and structured illumination. dSTORM routinely reaches 20-30 nanometers lateral resolution by precisely localizing individual blinking fluorophores across thousands of frames, effectively circumventing Abbe diffraction limit of about 200 nanometers. Phase contrast and DIC remain diffraction-limited and label-free, while confocal improves axial resolution only to about 500 nanometers. dSTORM therefore reveals protein cluster organization, chromatin loops and cytoskeletal periodici

Ref: NCERT Biology Class XII Principles on Klenow fill-in labeling, Lehninger Chapter 9 DNA cloning techniques, and Molecular Cloning by Sambrook Chapter 10 documenting end-labeling of cohesive termini.

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Microscopy

What is the principle behind STED microscopy?

STED, stimulated emission depletion, breaks the diffraction limit by superimposing a second doughnut-shaped depletion laser over the excitation spot. The first laser excites fluorophores in a diffraction-limited volume, while the red-shifted high-intensity STED beam forces excited molecules in the periphery back to ground state via stimulated emission before spontaneous fluorescence occurs. Only molecules at the zero-intensity centre remain fluorescent, shrinking effective point spread function to 30-50 nanometers. Scanning this narrowed spot builds super-resolved images of synapses, cytoskele

Ref: NCERT Biology Class XII Principles on Klenow fill-in labeling, Lehninger Chapter 9 DNA cloning techniques, and Molecular Cloning by Sambrook Chapter 10 documenting end-labeling of cohesive termini.

View Details